This is a picture of "Singer Boys". The picture is from 1993.
There are several references Judy and I highly recommend.
One is : “A Celebration of Rare Breeds Volume II” by Cathy J. Flamholtz, 1991, OTR Publications, Centreville, AL, Pgs 147-154 and there is a picture of a Phil Persky Singer on a frontus page. Phil Persky was an early Singing Dog pioneer. He kept his Singers in an apartment in NY City.
I think Ms. Flamholtz's book has been grossly overlooked by nearly all Singing Dog enthusiasts. Her work is excellent and offers insights into Singing Dogs whaich have been captured by no other author. She also lists references found in no other work. Those references take a reader even deeper into Singing Dog history and their place in and impact on, tribal NG society.
Another always good reference is the ZAA(Zoological Association of America. Their journal articles are top-notch. www.zaa.org or firstname.lastname@example.org.
"New Guinea Singing Dog". United Kennel Club. 1 January 1998.
Muller, Natalie (13 September 2011). "Dingoes originated in China 18,000 years ago". Australian Geographic. Australian Geographic Society.
Flamholtz, Cathy J. (1991). A Celebration of Rare Breeds Vol.II. Centreville, AL U.S.A.: OTR Publications. pp. 147–151.
Funk, Holger (2006)"Shiba and Dingo"
Flannery, Tim (1995). Mammals of New Guinea (2nd ed.). Ithaca, NY: Cornell University Press.
Bino, R. (1996). "Notes on Behavior of New Guinea Singing Dogs". Science in New Guinea 22 (1)]
Ehrlich, Don (Summer 2011). "Singers Singing-Hear the Cry of the New Guinea Singing Dog". Zoological Association of America Newsletter & Journal 5 (2).b
Kristofer M. Helgen, Stephen J. Richards, Robert Sine, Wayne Takeuchi, Bruce M. Beehler (2007). "A Rapid Biodiversity Assessment of the Kaijende Highlands, Enga Province, Papua New Guinea". Conservation International.
Peter Savolainen, Thomas Leitner, Alan N. Wilton, Elizabeth Matisoo-Smith, Joakim Lundeberg (Edited by Colin Renfrew) (2004). "A detailed picture of the origin of the Australian dingo, obtained from the study of mitochondrial DNA". Proceedings of the National Academy of Sciences in the United States.
Wilton, Alan (April 2010). "Genome-Wide SNP and Haplotype Analyses Reveal a Rich History Underlying Dog Domestication". Nature 464.